South Africa's annual sardine migration attracts a host of eager predators, each perfectly adapted to take advantage of the bounty. Common dolphins use sonar to 'herd' sardines into more manageable baitballs – something that many creatures benefit from.
The growth of biofouling on aquaculture infrastructure is a universal challenge. Standard industry practices to remove biofouling in finfish aquaculture typically include in situ net cleaning via power washing.
Since those cleaning practices can be potentially harmful to fish-gill health and expensive, development of other non-toxic biofouling controls is an industry priority.
Deposit-feeding sea cucumbers are potentially well suited for biofouling control due to their feeding mechanism, but remain relatively untested in this capacity. We examined the use of California sea cucumbers (Apostichopus californicus) to control biofouling on cages containing adult Chinook salmon (Oncorhynchus tshawytscha) at a commercial farming operation.
Four cage types were established: cages with salmon and sea cucumbers, cages with salmon only, cages with sea cucumbers only, and cages without either species. Results showed that the sea cucumbers actively fed on biofouling when salmon were absent (~16% cleaner on average) but preferred to consume uneaten feed/faeces at the bottom of the cages, neglecting the biofouling, when the salmon were present.
It is hypothesized that biofouling control in cages with salmon may be possible with an increased density of sea cucumbers.[...]
There is little direct fishing for flatfish such as turbot, plaice and butter flounder in Norway. The exceptions are halibut and blue halibut. For some of the shrimp trawlers in the Skagerak, perhaps trawling for plaice and other flatfish can bring good income in periods.
The prices achieved for flatfish at Danish auctions are currently very good.
Norwegian boats show little interest in flatfish
The most important tools are trawls, seines and nets. Along with plaice, other flatfish are also caught. The bycatch is more valuable than ever before. Norwegian vessels do not fish directly for flatfish. Large catches are therefore low. But after that Fiskerimagasinet, something may change due to the crisis in shrimp fishing. Plaice and other flatfish can become important for Norwegian trawlers.
In several Danish fisheries, bycatch of cod is settled against quotas. Trawlers must therefore avoid catching cod. By having a low opening on bottom trawls in fishing for plaice, less cod is caught, but a greater proportion of other flatfish. Norwegian trawlers fishing in the Skagerrak have a small annual quota of cod. In addition, 2.5 per cent by-catch of cod is legal if trawling for flatfish.[...]
The president of the Shipowners' Union mentioned that the responsibility for the opening of the season this month corresponds to Conapesca
MAZATLAN. – Shrimp reproduction is experiencing a notable delay in its cycle this year, and determining the start date of the fishing season in bays, estuaries and the high seas depends on this, commented Jesús Omar Lizárraga Manjarrez, president of the Union of Shipowners of the Pacific Ocean coastline.
He pointed out that deep-sea fishermen face growing uncertainty regarding the lifting of the ban, a stage that generally occurs in September, but is subject to the decision of Conapesca.
Lizárraga Manjarrez stated that the fishing sector faces another significant obstacle due to the lack of resources to launch the vessels, namely, the shortage of fishermen's labor.
The fishing leader expressed that many sailors have chosen to migrate to other activities, since in fishing they do not find the means to support their families, which has resulted in them not returning to their work on the boats.[...]
Weak Norwegian krone in August brought new growth for seafood exports
Norway exported NOK 14.2 billion worth of seafood in August. This is an increase of NOK 1.8 billion, or 15 per cent, compared to the same month last year.
“The devaluation of the krone is the main reason for the increase in the export value. In August, the Norwegian krone was as much as 16 per cent weaker against the euro than in the same month last year.
The artisanal hake fishermen of Caleta Portales, in the Chilean region of Valparaíso, and Caleta Cocholgüe, in the Biobío region, have seen their incomes diminish due to the scarcity of the resource, which has worsened in the months prior to the start of the the ban on common hake that is in force throughout September. This is evidenced in Oceana's latest work, "Poverty in the nets", a short documentary where fishermen expose the crisis they are experiencing.
Source: IndustriasPesqueras | Read the full articlehere
The Summit Camp research station recorded its hottest month of July on the Greenland ice sheet, accentuating the urgency of the work of the scientists of this mission, in search of knowledge about the effects of global warming on the fjords.
"The risk is the disappearance of an entire ecosystem," explains Eric Marechal, one of these scientists, director of research at the National Center for Scientific Research (CNRS) in France and a specialist in microalgae present in snow and ice.
The U.S. Department of Commerce (DOC) has upheld antidumping tariffs on frozen warmwater shrimp exports from two Indian companies and slightly increased the rate for all others after finalizing an administrative review.
The U.S. imposes antidumping rates on foreign shrimp imports believed to be priced below fair market value in an attempt to bolster domestic production.
Author: Toan Dao / SeafoodSource | read the full articlehere
Spanish research centre achieves first tank-bred Atlantic bluefin as NGOs warn of poor welfare, more antibiotic use and water pollution
The first successful breeding of Atlantic bluefin tuna at a Spanish research centre has spurred at least two companies to ramp up plans for the industrial farming of land-bred tuna.
The companies would be the first to use only tank-bred Atlantic bluefin stocks of fertilised eggs or young tuna. Up to now, farming of Atlantic bluefin has relied on catching young wild fish and fattening them in open-sea cages.
After the breakthrough in July at the government-run Mazarrón aquaculture plant in Murcia, the company Next Tuna said it plans to begin building a tuna farm north of Valencia. Nortuna, a Norwegian company, has also signed a deal with Mazarrón for the firm’s pilot site in Cape Verde, off the west coast of Africa.
Commercial aquaculture companies argue that as more fish are farmed from stocks in closed tanks, fewer wild Atlantic bluefins will be caught for fattening or immediate consumption, reducing pressure on sea stocks.[...]